Tube



L. H. BRiNKMAN.

TUBE.

APPLICATION FILED MAY 9, 1917.

1,327,195, 'Patgnted Jan. 6, 1920.

UNITED. STATES PATENT OFFICE.

LOUIS H. BRINKMAN, 0F GLEN RIDGE, NEW JERSEY, ASSIGNOR '1'0 TITEFLEX METAL HOSE CORPORATION, A CORPORATION OF NEW YORK.

TUBE.

Application filed May 9, 1917. Serial No. 167,510;

To all whom it may concern:

Be it known that I, LOUIS H. BRINKMAN, a citizen of the United States, residing at #248 Ridgewood avenue, Glen Ridge, county of Essex, State of New Jersey, have invented new and useful Improvements in Tubes, of which the following is a specification.

This invention relates to tubes formed from a helically wound strip.

The main object of the invention is to provide a tube of the character described which shall be of simple construction and require small expense to manufacture, but which shall be strong, reliable and sufiiciently ti ht for' many purposes, for instance mu er tubes.

Other and ancillary objects of the invention will appear hereinafter.

In the accompanying drawings, illustrate the invention,-

Figure 1 is a perspective view of the initial flat ribbon or strip from which the tube is formed;

Fig. 2 is a perspective view of the strip which after having been formed to have a cross section so that it is suitable for winding into the tube, and j Fig. 3 is a side elevation of the tube, partially in section.

Referring to the drawings, a strip 1 of brass, steel or other material. of fiat,'ribbonlike form as shownin Fig. 1 may have its section shaped by rolling or otherwise into the form as shown in Fig. 2 wherein the strip has a longitudinal central groove 2 upon the two sides of which are longitudinal grooves 3 and 4 opening in the opposite direction from the groove 2. It will also be observed that the depth of the groove 2 is greater than that of the groove 3 or l.

The strip of Fig. 2 is coiled into a helix, as by winding on a mandrel, to form a tube as shown in Fig. 3, the walls of the groove 4 at one side of the groove 2 being nested within the groove 3 0n the other side of the groove 2 so as to secure the contiguous edges of adj acent convolutions together. Here the groove 2 opens exteriorly and the grooves 3 and 4 open interiorly of the tube. In the strip as shown in Fig. are of the same size so that when the walls of one are forced Within the other by the Specification of Letters Patent.

2 the grooves 3 and 4 Patented Jan. 6, 1920.

formation into the tube, the outer walls will grlp the inner so that they are more se curely held together.

While the invention has been illustrated in what is considered its best application, it

may have other embodiments without departing from its spirit and is not therefore limited to the structure shown in the drawings, the appended claims pointing out the invention in accordance with the patent statutes.

What I claim.is

1. A tube comprising a helical strip having a central longitudinal groove and a longitudinal groove upon each side of the aforesaid groove, the central groove being much deeper than either of the others, the grooved portion at one edge of the strip nesting. within the groove at the other edge, the adjacent edges of convolutions being adapted to be held against relative movement longitudinally of the tube solely by the said nested relationship of the grooved walls.

2. A tube comprising a helical strip having a longitudinal groove adjacent each edge, and a central groove deeper than either of the others, the grooved portion of one edge of the strip nesting in the groove at the other edge, the walls of one groove gripping the walls of the other.

3. A tube comprising a helical strip having a longitudinal groove adjacent one edge and a bent section adjacent the other edge, and a central groove deeper than any other groove in said strip, the said bent section being within said groove, the spring of the material pressing the strip portion within the groove against the walls thereof.

4. A tube comprising a helical strip having a central longitudinal groove and a longitudinal groove upon each side of the aforesaid groove, the central groove being much deeper than either of the others, the grooved portion at one edge of the strip nesting within the groove at the other edge of the strip, the inside groove when in the nested relationship, being before such nesting, of a size not less than that of the outer groove whereby after nesting it presses against the outer groove.

In testimony whereof I have signed this specification this 4th day of May, 1917.

Louise. BRINKMAN. 

